AS14928 ADAMS-CATV

The reverse names write each address backwards as four separate labels, so every host looks like a subdomain four levels deep.

What it's used for

• A cable and telephone company's broadband network. 28,928 addresses across six IPv4 prefixes plus one IPv6 prefix, 2607:3e00::/32, with a single observed BGP neighbour.

Notable

• Five blocks carry the netname PENTELEDATA, registered to PenTeleData Inc.
• The sixth, 23.172.16.0/24, carries PTD-BROADBAND-NAT64.
• Seventeen of eighteen sampled addresses returned a name, all of the same shape: 0.16.28.72.scpe.echoes.net, 254.47.28.72.scpe.echoes.net, 190.16.172.23.scpe.echoes.net.
• The AS is held under the handle ADAMS-CATV, a name that appears nowhere in the registrations.

Interesting

• Writing the octets in reverse order mirrors how the reverse lookup itself is structured, so the answer restates the question with a different suffix. It is the least ambiguous scheme in this range and the least readable.
• Because each octet is its own label, the names inherit any policy applied at the third or fourth level, and a wildcard placed one level up would cover an entire block at once.
• A netname declaring NAT64 on a /24 is a provider running IPv6-only customers and translating their traffic to reach the older internet. One small block absorbs all of it, which is the point.
• The handle preserves a cable operator's name that the registrations have moved past. Handles are assigned once and rarely revisited, so they end up as the oldest surviving label on a network.
• A single neighbour on 28,928 addresses means one upstream and no alternative path.